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1 Journal of Plant & Agriculture Research Open Access Scientific Publisher Research Article BIOCONTROL OF POST-HARVEST FUNGAL DISEASES OF CITRUS SCINENSIS (SWEET ORANGE) USING LEAF EXTRACTS OF AZADIRACHTA INDICA (NEEM) AND CHROMOLAENA ODORATA ABSTARCT Edward Ntui Okey 1 1 Department of Biological Sciences, Akwa Ibom State University, Ikot Akpaden, Nigeria Correspondence should be addressed to Edward Ntui Okey Received August 22, 2015; Accepted September 13, 2015; Published September 30, 2015; Copyright: 2015 Edward Ntui Okey et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Cite This Article: Ntui Okey, E.(2015). Biocontrol of post-harvest fungal diseases of Citrus scinensis (Sweet orange) using leaf extracts of Azadirachta indica (neem) and Chromolaena odorata. Journal of Plant & Agriculture Research, 21 1(1).1-8 Post-harvest deterioration is a major problem of sweet orange (C. sinensis) production in Akwa Ibom State, Nigeria. Miicrobial infection of the fruits is mainly responsible. The present study was therefore, carried out to identify and biologically control the micro-organisms responsible for orange fruit rot during storage. Aqueous leaf extracts of Azadirachta indica and Chromolaena odorata were used as biological agents against fungal isolates. Samples of rotten orange fruits were collected from different markets across the state. Four fungal isolates (Penicillium digitatum, Aspergillus niger, Aspergillus flavus and Cladosporium herbarum ) obtained from naturally infected fruits were confirmed to be causal agents through pathogenicity testing. Phytochemical analysis of the extracts revealed higher amounts of polyphenols, flavonoids, saponin, tannin and alkaloids in A. indica compared to C. odorata. In-vitro investigations showed that 30% concentration of A. indica leaf extracts caused highest mycelial growth inhibition of the four pathogens (70, 75, 83 and 88% respectively) compared to the control, while extracts of C. odorata caused relatively lower inhibition of mycelial growth (50, 61, 61, 62% respectively) at the same concentration. Percentage inhibition increased with increase in extract concentration. These results indicate that aqueous leaf extract of A. indica is a better biocontrol agent of post-harvest orange fruit fungal diseases. Further studies are ongoing to test the validity of these results in the field. KEYWORDS: Sweet orange, spoilage, fungi, leaf extract INTRODUCTION Citrus sinensis is a medium size tropical plant generally cultivated in the Tropical, Sub-Tropical and Mediterranean regions. It is the most popularly cultivated fruits accounting to about 78.2% million metric tonnes in 1991; followed by grape, banana, and apple which were 55.9, 47.8 and 39.6 million metric tonnes respectively [1]. In Nigeria, commercial cultivation in large plantations is mostly within the middle belt. However, some Southern states and those in the far North also engage in Citrus large scale cultivation [2]. In the South-South region including Akwa Ibom cultivation is mainly by individual farmers. Mature Citrus sinensis fruits are reported to contain 87.67% moisture, 11% carbohydrates with a calorific value of 48cal/100g [1]. These fruits are also rich in organic acids, essential oils beta carotenes, vitamin C, effective antioxidants and their pulps contain significant amounts of protein and soluble fibres [3]. The presence of flavonoids, carotenoids and limonoids in these fruits make them useful as anti-cancer, anti-viral as well as anti-inflammatory products [4]. On the other hand, Citrus fruits have high susceptibility to attacks by pathogenic fungi, due to their JPAR 07 Volume 11 Issue
2 2 low ph high moisture content and nutritional composition. These attacks result in fruit rots and other diseases which make them unsuitable for human consumption due to mycotoxin production. Reports on Citrus post-harvest fungi rots are extensive and world-wide. A number of fungal species including Phythium, Phytophthora, Botryodiplodia, Aspergillus, Penicillium, Rhizopus, Glasdosporium, Mucor, have been associated with Citrus fruit rot [5,6,7]. Harvesting injuries, improper handling during transportation and poor storage facilities are general predisposing conditions for fruit rot development especially in economically stressed communities. In Nigerian markets, 20-90% fruits displayed for sale are reported to show symptoms of microbial infection [5] Due to environmental concerns, the control of plant diseases is now focusing on the use of natural products in place of traditional chemicals with hazardous effects. This study was therefore, conducted to identify the pathogenic fungi and also to determine the possibility of using water leaf extracts from A. indica and C odorata as biocontrol agents of these pathogens. MATERIALS AND METHODS Sampling Sites Five main markets were selected one each from the following locations: Ikono, Eket, Okobo, Ika and Uyo. Local Government Areas of Akwa Ibom State. These locations represent the North, South, East, West and Central regions of the State. Sample Collection A total of 100 samples in batches of 20 were randomly selected from each market location. Infected orange fruits were identified by physical examination following the method described by [8] method. Fruits were said to be infected when they possess purple, dark brown or black rots symptoms. Healthy oranges were also collected to serve as controls. Percentage fruit infection was assessed to determine the severity or incidence of rot in each of the five markets. Sampling was carried out between March 2013 and March Isolation And Identification Of Fungal Isolates Samples of apparently diseased fruits were surface sterilized by wiping with 85% ethanol and rinsed in three changes of sterile distilled water. These were then blotted dry and portions from the advancing edges of lesions were obtained using sterile knives. One gram of each cut portion was then homoginized using a sterile glass rod and a test tube in 9ml of sterile distilled water to produce a 101 concentration. Journal of Plant & Agriculture Research Potato Dextrose Agar plates containing Chloromphenicol (30mg/l) to prevent bacterial growth were inoculated with 0.1ml aliquots of homogenates and incubated at 25 o C for 7 days. Lactophenol cotton blue stain was employed and observations of morphological characteristics of isolates were made using the Olympus model light microscope. The identification of fungal isolates was carried out based on cultural and morphological features [9] Pathogenicity Test Healthy oranges were surface sterilized and holes made using a 3mm sterile cork borer. 3mm portions obtained from advancing margins of PDA plates of each isolate were separately inserted into the holes and these holes were sealed with Vaseline jelly to prevent other microbes from entering the tissues. Both inoculated and uninoculated oranges were separately incubated in plastic containers at 25 o C for 7-14 days. Within this period, observations were made for growth of fungal colonies which were matched with the colonies used as sources of inoculum. Preparation And Analysis Of Plant Extract Fresh leaves of A. indica and C. odorata were collected from around the Akwa Ibom State University Main campus and plant extracts prepared as described by [10] A portion of the extract was used for phyochemical screening following the method of [11]. Dilutions of 10, 20 and 30% concentrations (v/v) were prepared and used for bioassays. Effects Of Extracts On Pathogenic Fungi The effects of leaf extracts on fungal pathogens was assessed based on mycelial growth as described by [10] The incubation was carried out at C and terminated at 7 days when the control mycelia had reached the edge of the Petri dish. The set up was carried out in triplicates. Percentage inhibition of mycelia growth was then determined using the formula: P1 - P2 P1 x 100 where P1= radial distance in negative control; P2 radial distance of pathogen with treatments. Statistical Analysis All experiments were performed trice. Data were analyzed with Analysis of Variance using MSTAT-C program version 2.10 [12]. The least significant difference (LSD) was used to test for significant differences between treatments at P 0.05 [13] 1
3 RESULTS AND DISCUSSIONS Disease Incidence Journal of Plant & Agriculture Research The rate of Citrus sinensis postharvest fungal infection in five markets are shown in Figure 1 Ika market recorded the lowest percentage infection of 32 followed by Eket with 34%. Ikono, Okobo and Uyo had 38, 38 and 46% respectively. High incidences of Citrus sinensis post-harvest fruit rot ranging from 20-90% have been reported in other states of the country [5,14 and 15]. The high infection rates could be associated with poor postharvest handling, improper transportation processes and inadequate storage facilities. Ripe fruits are often packed in jute bags which could be stored for days before taken to the markets Figure 2 Also, oranges are transported to the markets parked in open buses Figure 1: Percentage infection of C. sinensis fungal rot in five market areas of Akwa Ibom State 32% 46% 38% 34% IKONO EKET OKOBO IKA UYO 38% In addition, fruits are often openly displayed for sale in the markets Figure 4 These conditions certainly favour fungal growth and consequent disease development. Uyo, a metropolitan city had the highest fruit rot incidence. Being the state capital, it has the largest market and most farmers/traders prefer transporting their produce to this centre from long distances. Sometimes these oranges are transported from other states and could take several days before getting to Uyo considering our deteriorated road conditions. Figure 2: Jute bags packed with ripe Citrus fruits 3
4 Journal of Plant & Agriculture Research Figure 3: A Bus Conveying Sweet Oranges To The Market Figure 4: sweet oranges displayed for sale in the market 4.
5 PATHOGENICITY TEST Journal of Plant & Agriculture Research Four fungi isolated from naturally infected sweet orange fruits were confirmed causal agents of postharvest rot through pathogenicity test (Table 1). Table 1: Fungal Isolates from five market areas in Akwa Ibom State Sampled Markets Fungal Isolates P. digitatum A. niger A. flavus C. herbarum Ikono Eket Okobo Ika Uyo (+ = present; - = absent) P. digitatum and A. niger were found to be most prevalent as they were present in all the five sample sites. A. flavus was recorded in Ikono, Eket, Okobo and Uyo markets while C. herbarum was present in Eket Ika and and Uyo. All the four fungal pathogens were found in Uyo and Eket markets Table 1 The pathogens in this study have earlier been associated with sweet orange fruit rot in other parts of the country [5, 7, 14 and 16]. In other parts of the world, a number of other fungi species (Phytophthora, Rhizopus, Trichoderma, Curvularia, Botryodiplodia, Mucor, Gloesporium, Fusarium, Saccharomyces etc) have also been implicated in sweet orange postharvest rot [17, 18 and 19]. It is obvious that ripe sweet orange fruits are highly susceptible to a wide range of fungi. This may be attributed to their succulent tissues and high nutritional composition which forms growth medium for various pathogens. 5
6 Journal of Plant & Agriculture Research PLANT EXTRACT ANALYSIS Results of phytochemical analysis of A. indica and C. odorata leaf extracts are shown in Table 2. Leaf extracts of A. indica were found to contain relatively more of all the substances identified compared to extracts of C. odorata. Similar compounds were reported in extracts of Theobroma cacao [10]. Table 2: Phytochemical constituents of extracts Chemical compounds Presence/Absence A. Indica C. Odorata Polyphenols Flavonoids Sapronin Tannin ++ + Alkaloids = low; ++ = moderate ; +++ = high content LEAF EXTRACTS BIOASSAYS The bioassay results indicated antifungal activities in the two extracts with A. indica being more effective in inhibiting mycelia growth when compared to C. odorata ( Figs. 4 and 5). Percentage inhibition was also found to increase with increase in concentration of extracts. At 30% concentration, A. indica recorded 70, 75, 83 and 88% inhibition respectively for the four pathogens while C. odorata at the same concentration had 50, 61, 61 and 62% inhibition respectively. The higher inhibitory effects of A. indica extracts could be associated with higher contents of the five phytochemical compounds as compared to relatively lower contents in C. odorata. 6 A number of crude plant extracts including A. indica, Ocimum graticimum, Allium cepa, Allium sativum, Theobroma cacao, Aframomum melequeta, C. odorata,mangifera indica, Vernonia amygdalina etc have also been reported as alternative plant disease control agents [5, 6, 7, 10, 20 and 21]. These extracts are reported to contain phytochemical substances identical to those recorded in this study. They are considered environmentally friendly and therefore, preferred to synthetic pesticides that have been traditionally used in the control of plant diseases. Apart from being hazardous, synthetic pesticides are expensive and most farmers are unable to afford these products. The fact that plants used in these study are easily available, couple with their simple methods of extraction and application, makes them potential cheap alternatives for the control of fungal sweet orange postharvest rot. However, further investigations are required to confirm their field applications.
7 Journal of Plant & Agriculture Research Figure 5: Inhibitory effect of A. Indica leaf extract on mycelia growth of fungal pathogens PERCENTAGE INHIBITION % 20% 30% 0 P. digitatum A. niger A. flavus C. herbarum PATHOGENIC FUNGI Figure 6:Inhibitory effect of C. Odorata leaf extract on mycelia growth of fungal pathogens PERCENTAGE INHIBITION % 20% 30% 0 P. digitatum A. niger A. flavus C. herbarum PATHOGENIC FUNGI CONCLUSION Leaf extracts of A. indica and C. odorata have great biopesticide potentials for the control of post-harvest fungal fruit diseases of sweet orange. REFERENCES [1] Shimshon, B.Y., Eliezere, E and Moshe, B.A. Citrus fruits: In Encyclo. of Agric. Sci. (eds R.K. Robinson and M.J. Sadler), Academic Press, New York, 1994,
8 8 [2] Oyegun, M. Citrus cultivation and processing. Raw Materials Update, 2002, 3(1): [3] Bendre, A.M. and Pende, P.C. Introductory Botany: Rastogi publications Meerut, India, [4] Brehow, M.A., Hasegawa, S and Manners, G.D. Citrus Limonoids: Founctional Chemicals in Agriculture and Food. American Chemical Society, Washington DC [5] Dim, M.U. A survey of diseases of Citrus in Oweri zone of Imo State. Project work, Department of Plant Sciences and Biotechnology, Imo State University [6] Arekemase, M.O. and Oyeyiola, G.P. Centerpoint (Science Edition) vol. 14 (1): [7] Etebu, E.N. and Nwauzoma, A.B. A review of sweet orange (C. Sinensis), health disease and management. American Journal of Research Communication 2014, 2: [8] Fawole, M.O. Oso, B.A. Laboratory Manual of Microbiology. 1 st Edition. Spectrum Books Ltd, Ibadan, Nigeria, 1995, pp [9] Akinmusire, O.O. Fungal species associated with the spoilage of some edible fruits in Maiduguri, North Eastern Nigeria. Advances in Environmental Biology. 2011, 5(1): [10] Okey, E.N., Duncan, E.J., Sirju-Charman, G., and Sreenivasan, T.N. Zoospore germination and growth of Phytophthora palmivora in stem extracts as criteria for assessing cacao resistance. Mycological Research, 1997, 101(6): [11] J.B. Harbone, J.B. Phytochemical methods and guide to modern techniques of plant analysis. 2nd Ed. Chapman and Hall, New York,1973. [12] MSTAT-C. A software programme for the design, management and Analysis of agronomics research and experiments. Michigan State University Press, [13] Gomez, K.A. and Gomex, A.A. Statistical procedure for Agricultural Research. John Wiley and Sons, New York, [14] Bukar, A., Mukhtar, M.D. and S. Adamu, S. Isolation and identification of postharvest spoilage fungi associated sweet oranges (C. Cinensis) traded in Kano Metropolis. Journal of Pure and Applied Sciences, (1): [15] Elegbede, J.A. and Gould, N.M. Monoterpens reduced addicts formation in rats exposed to afflatoxin Bi. African Biotechnology, 2009, 1: [16] Ojo, A.O., J.J. Olaifa, J.J. and Odelade, K.A. Survey of the post-harvest diseases and afflatoxin concentration of market orange fruits (Citrus sp.). American Journal of Research Communication, [17] Graham, J.M. and Timmer, L.W. Phytophthora diseases of Citrus. A series of the plant pathology department, Florida Co-operative Extension Service, Institute of Food and Agricultural Science, University of Florida, Life Sciences, 1994 [18] Timmer, L.W. and Menge, J.A. Common names of plant diseases. Disease of Cirus. APS Press Books, [19] Sharma, P., and Verma, P. O. First report of soft rot, a post-harvest disease of sweet orange from India. Journal on New Biological Reports, 2013, 2(1): [20] Okigbo, R.N., Putheti, R.R. and Achusi, C.T. Post harvest deterioration of cassava and its control using extracts of Azadirachta indica and Afromomum melequeta. Europen Journal of Chem.,2009, 6: B.Y. Shimshon; E. Eliezere; B.A.Moshe. Citrus fruits In : Encyclo. of Agric. Sci. (eds Robinson, R.K. and Sadler, M.J.) Vol 1. Aceademic press New York,1994, pp [21] M.N. Suleiman and A.F. Ogundana. Annals of Biological Research, 2010, 1 (4) Journal of Plant & Agriculture Research
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